INIBIOMA   20415
INSTITUTO DE INVESTIGACIONES EN BIODIVERSIDAD Y MEDIOAMBIENTE
Unidad Ejecutora - UE
artículos
Título:
Are northern Patagonian wetlands reservoirs of Ochetophila trinervis infective Frankia?.
Autor/es:
CARDOSO B., CHAIA E. E. Y RAFFAELE E.
Revista:
SYMBIOSIS
Editorial:
SPRINGER
Referencias:
Año: 2010 vol. 52 p. 11 - 19
ISSN:
0334-5114
Resumen:
Abstract Mallín (plural mallines) is a particular kind of
wetland occurring in Patagonian steppe and forests. In
Northwest Patagonia, mallines are humid meadows with
high net primary production. It was previously found that a
mallín soil in the steppe devoid of actinorhizal plants had a
higher Frankia nodulation capacity in Ochetophila trinervisMallín (plural mallines) is a particular kind of
wetland occurring in Patagonian steppe and forests. In
Northwest Patagonia, mallines are humid meadows with
high net primary production. It was previously found that a
mallín soil in the steppe devoid of actinorhizal plants had a
higher Frankia nodulation capacity in Ochetophila trinervisFrankia nodulation capacity in Ochetophila trinervis
(sin. Discaria trinervis) than other soils in the region.
Under the hypothesis that mallín wetland meadows are
reservoir of infective Frankia, we studied the FrankiaDiscaria trinervis) than other soils in the region.
Under the hypothesis that mallín wetland meadows are
reservoir of infective Frankia, we studied the FrankiaFrankia, we studied the Frankia
nodulation capacity in O. trinervis of 12 mallín and their
neighbouring steppe soils, by using plant bioassays. A
qualitative plant bioassay showed that infective FrankiaO. trinervis of 12 mallín and their
neighbouring steppe soils, by using plant bioassays. A
qualitative plant bioassay showed that infective FrankiaFrankia
was present in most soils. The number of nodules per plant
in seedlings inoculated with mallín soils was negatively
correlated with soil water content while the opposite was
true for plants inoculated with soils from neighbouring
steppe. A quantitative bioassay was performed with eight
representative soils, selected according to the number of
nodules per plant produced in the qualitative assay and to
the presence or not of different actinorhizal plants at the
sites. Frankia nodulation units per cm3 of soil (NU) in
mallín soils were higher than those in steppe. Water and
organic matter content of soils were correlated with the
higher nodulation capacity of mallines, which may account
for the saprotrophic growth of Frankia in soils. The
symbiosis was effective in plants inoculated with all soil
samples. These results suggest that Northwestern Patagonian
mallín wetland meadows are reservoirs of infective and
effective Frankia propagules in O. trinervisFrankia nodulation units per cm3 of soil (NU) in
mallín soils were higher than those in steppe. Water and
organic matter content of soils were correlated with the
higher nodulation capacity of mallines, which may account
for the saprotrophic growth of Frankia in soils. The
symbiosis was effective in plants inoculated with all soil
samples. These results suggest that Northwestern Patagonian
mallín wetland meadows are reservoirs of infective and
effective Frankia propagules in O. trinervisFrankia in soils. The
symbiosis was effective in plants inoculated with all soil
samples. These results suggest that Northwestern Patagonian
mallín wetland meadows are reservoirs of infective and
effective Frankia propagules in O. trinervisFrankia propagules in O. trinervis